International Rescue attempt their most difficult mission ever while defending Tracy Island from a dangerous assault.

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Gordon travels in Thunderbird 4 to recover Braman but discovers that the Chaos Crew have gotten to the robot first. An underwater battle ensues and both Thunderbird 4 and Gordon are harmed.

Gordon ventures deep into the Marianas trench to rescue a survey team, and ends up discovering an early International Rescue prototype vehicle once flown by Jeff Tracy. Gordon takes Thunderbird 4 down to save the crew and get a better look at the prototype. But the survey ship, designed by The Mechanic, transforms and wrecks Thunderbird 4. Gordon is forced to abandon ship and seek refuge on his dad’s TV-21 plane. To save the survey crew, Gordon powers up the plane and manages to take it up to the surface.

International Rescue attempt their most difficult mission ever while defending Tracy Island from a dangerous assault.

International Rescue are dispatched to save one of their own when the Hood traps Lady Penelope and Parker inside an underwater hyper-train loop during a high-stakes robbery.

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When a transport ship carrying colonists heads straight into the asteroid belt between Mars and Jupiter, Thunderbird 3 is deployed to regain control.

Lady Penelope brings John as her guest to a charity event while Gordon and Alan take the watch aboard Thunderbird 5.

Through the use of archive footage, Brains informs the team of a discovery, but in order to gather more information, our heroes split into groups and search for an escape pod missing since Jeff Tracy's crash.

During a joint operation between International Rescue and the Global Defence Force, a series of mishaps nearly ends in disaster. In the wake of the botched mission, Colonel Martin Janus takes over the GDF...

A facility known as CATCH, from where all air traffic in North America is controlled is sabotaged and Scott and Virgil handle a rescue mission involving a mid-air plane collision while Kayo infiltrates the facility using Thunderbird Shadow. Kayo discovers that this is a diversion and part of a much bigger plan by the Hood. Disregarding Scott and John's instructions regarding International Rescue's mission to save people and not act as policemen she puts herself in danger and is saved by an unlikely source.

Thunderbirds 3 and 4 are need on Europa, one of Jupiter's moon, when a pair of documentarians fall into an ice ocean. This leads Alan to make first contact with an alien lifeform.

After the Mechanic flees the scene with the TV-21, Scott is in hot pursuit. But, when the villain steals some volatile iridium, Brains must make drastic alterations to Thunderbird 3 to save the day.

Lady Penelope, Parker and Kayo arrive on the scene of a massive semi-submersible ocean oil rig to decommission the polluting relic, but supervisor Malloy has other plans.

IR receives a distress call from the Calypso, a space vessel returning from a long mission. Scott and Virgil get aboard the plummeting ship and locate the disoriented crew along with an old robot named Braman, who sent the original distress call.

International Rescue scrambles all the flight-capable Thunderbirds to rescue the crew of CIR.R.U.S, a high-atmosphere weather station, now in danger due to the arrival of a fierce storm. TB1, TB2 and TB3 are quickly crippled by the conditions, and the only hope of salvaging the mission lies with TB5 - and John's ability to mount his most daring rescue ever.

In order to build a T-drive engine for the Zero-X, Brains needs help from the Mechanic. The trouble is, the Mechanic is locked inside a space prison known as the Hex.

A series of cascading equipment failures leads John to realise that rogue A.I. has gained control of Thunderbird 5. The programme is sending false monitor images to Tracy Island to deceive the other brothers. John finally gets through to Lady Penelope and informs her of the situation. Once the other brothers figure out what is going on, Alan is despatched in Thunderbird 3 to rescue John.

Concerns arise when a meteor shower is projected to hit the decommissioned Shadow Alpha One moon base, and attempts at contacting the lone crew member, Captain Lee Taylor, are unsuccessful. Scott and Alan take Thunderbird 3 on a rescue mission and Scott boards the base and finds Taylor attempting to maintain the base and it's defence system against meteors. After initial attempts to defend the base, against continuing waves of meteors, Scott and Taylor are forced to abandon the base to meet Thunderbird 3 at a rendezvous on the moon's surface that itself is threatened by the meteor shower. Guest Star: Rich Hall as Captain Lee Taylor.

Virgil attempts to rescue a mining crew trapped inside a glacier, but the scientist in charge of the project refuses to leave.

In London the Crystal Spire, the tallest building in the world, catches fire due to an electrical overload and the local firefighters are rendered helpless. Virgil and Alan are called to extinguish the flames and rescue everyone trapped inside.

The chase is on and Kayo and Alan work quickly to re-capture Thunderbird 3 from Havoc. Meanwhile, Scott's efforts to extract the escape pod run into additional complications.

Kayo is riding aboard Fireflash, a supersonic airliner invented by Brains, but she is unaware that its controls have been tampered with. International Rescue notices the plane has vanished from their monitors and attempt to locate it. Kayo realises that the plane is flying in the wrong direction, and manages to avoid a powerful gas attack that has knocked out both passengers and crew.

A scientist accidentally locks herself inside a vault which is being used to store unstable matter. There is only one person who has successfully broken into a vault like this - Parker. Colonel Casey of the GDF recruits Parker for the job, but the safe cracker ends up locking himself and Lady Penelope inside as well. Virgil and Scott transport the vault to an isolated area on Thunderbird 2, where Parker and Penelope must try and free themselves and the scientist before the anti-matter explodes. Note: This episode is a homage to the original Thunderbirds episode, Vault of Death